Renewable fuse



April 22, 193 F: c. LAVARACK 1,755,546

RENEWABLE FUSE Filed March 25, 1928 V i I Patented Apr. 22, 1930 UNITEDSTATES PATENT QFFKIE FREDERICK C. LAVARACK, OF MONTCLAIR, NEW JERSEY,ASSIGNOR TO GREAT WEST- ERN FUSE COMPANY, OF PITTSBURGH, PENNSYLVANIA, ACORPORATION OF DELA- WARE V RENEWABLE FUSE Application filed March 23,1928. Serial No. 284,141.

The object which I have in view is the provision of a new and improvedrenewable fuse which will be efficient inservice, easy to take apart forrepair or renewal of the 6 fusible link and to reassemble, and of simpleand inexpensive yet durable construction. lVith these objects in View Ihave invented the improved renewable fuse hereinafter'described andclaimed.

In the accompanying drawings, where n I have illustrated the bestembodiment of the principles of my invention now known to me, Fig. 1 isa longitudinal'section of the fuse.

Fig. 2 is an outer end view of one of the ferrules. V v

Fig. 3 is a broken side elevation of one of the terminal blades with theslotted washer and sealing disk slipped thereon.

Fig. 4 is a plan View of the slotted washer and the sealingdisk withtheir slots in registration. I l

Fig. 5 is a reverseplan View of the same with the disk in its sealingposition relative to the washer.

' Fig. 6 is a side elevation of the terminal blades to which theslotted'washer and the sealing disk are applied.

Fig. 7 is an inner end view of the same. Fig. 8 is a broken sideelevation of one end i of the fuse, with the screw cap omitted and thesealing disk in section to better show it in its sealing position.

7 Fig. 9 is a broken elevation of the other endof the fuse with thescrew cap in section.

'"" v Fig. 10 is an inner end view of the terminal blade shown in Fig.9.

7 Referring first to the drawings, 1 represents the cylindrical shell ofinsulating material, such as fibre.

2 represents metallic ferrules mounted on the ends of the shell andfixedly attached thereto, as by threaded engagement and riveting. A Theferrules" on the twoends of the shell are preferably the same instructure.

'Each of the ferrules has a pair of diamet ricitlly opposed recesses orseats 3 out inits enc.

The shell and its ferrules form the tubular body of the fuse.

The outer ends of the ferrules 2 are' ex e axis of the disk.

riorly threaded for the application of the usual annular screw caps 4:.

and 6 represent the two metal terminal blades to whose reduced innerends the fusible link 7 is detachably secured, as by the screwbolts 8.

One of said blades 5, has permanently mounted thereon the circular metalclosure head 9 which fits against the end of the corresponding ferrule 2and is provided on its inner face with a diametrically disposed ribwhich engages the seat 3 and thus prevents the head and blade fromrotation relative to the ferrule. v V

The annular screw-cap 4 is slipped down over the blade 5 and screwedonto the ferrule to clamp the closure head and blade in positionrelative to the shell.

The other terminal blade 6 is provided with opposed notches 11 formingbetween them a neck of reduced width.

Adjacent to said reduced neck and on the inner side thereof a fixedabutment or plate 12 is mounted on the blade, protruding on each sidethereof, as best illustrated in Fig. 7.

When the fuseis assembled the abutment 12 lies substantially flush withthe outer end of the ferrule 2. h

13 represents 7 a slotted metal washer which slips down over the outerend of the blade 6 and rests against the abutment 12 and alsoagainst'the end of the ferrule to close the end of the fuse body.

The washer 13 is provided on its inner face with a pair of lugsle whichengage the seats 3 in the end of the ferrule and thus prevent rotationof the washer and the blade relative to the shell. 7 y

15 represents the sealing disk which is a metalplate preferably circularand of sub-' stanti ally the same diameter as the washer The disk 15 isprovided eccentricallly of its center with a slotted opening 16 ofsufficient width and length to allow the di sk to be slipped down overthe blade 6. f H

17 represents a second aperture of shorter length opening at one sideinto the aperture 16 but symmetrically disposed relative to the Theaperture 17 isof propel dilllfiHSiOhS to slotted opening 18 disposed ona line inter-set.

ing the axis of the disk and engaged by a headed screw 19 screwed into athreaded hole in the washer.

Thus the disk may be moved into the position relative to the washershown in Fig. 4 with the aperture 16 of the disk registering with theslot of the washer or into the position shown in Fig. 5 wherein theaperture 17 of the disk registers with the slot of the washer.

The slotted washer and the sealing, .disk in the relation illustrated inFig. 5L are slipped down over the blade 6 until the slotted washer restson the abutment 12 and its lugs 14 occupy the seats3.

, The sealing disk is then slid into its relative position illustratedin Fig. 5, with the aperture 17 embracing the neck of thehlade betweenthe notches 11.

It is evident that the disk thus seals from without the ends of the slotof the washer 13 and the sides of said ,slot are sealed from within bythe abutment 12, so that when the annular cap ,4 is slipped over theblade 6 and screwed up on the ferrule, thus ,clamping the washe 3 beween the abutment 12 and the sealing di and also against the end of theferrule, the passage of flame outwardly along th blad s pre nted.-

l assemblina the fuse, the assemble lade terminals and fusible link areinserted into the shell from the right in Fig. 1,-the closure head 9seating against the end of th correp nd ng e rule n it b '10 occupyi g te ferrule seats 3.

Th c ew c p ,4. sit n pplied to t t end o th h llyhsing s wed up nuglyin p sition- The slotted Wash r nd he. sealing disk ar then slid overthe other blade 6, the lugs 14 of he wa h r eng ging he seats 3.1 thesevent -ms fer u an he Wash r be ms On t e butme t 12 The sea ing di k ith shittedinte ts sealin pant es engasi a h notches 11.

he scr w Cap i then sl ep ew th blade 6 a d sewed down snealr 0n he flelV-hen it is desired to disassemble the fuse,

the screw cap is first removed frorn the left, end of the tusc in Fig. 1and the sealing diskh n sh fted int as r la e i Q-Iit e l Hated in Fig,5 and th Wa he an d sk ar hen l ft d off the ade??- The o her screw caps new emov d a the parts may then he lifted out-- It is evident from theforegoing that my i sievedirenewahlefuse is ofsimple an expensiveconstruction and contains no parts likely to become worn in use orsubject to breakage.

It is easily assembled and disassembled without requiring either skillor the use of tools.

The blade terminals are sealed against the escape of flame along thesame and thus dan ger of fire is avoided.

The permanent attachment of the sealing disk to the slotted washerfa'cilitatesthe handling of the parts and prevents the loss ormisplacement of the sealing disk.

What I desire to claim is 1. In a renewable fuse, the combination of atubular body, a terminal blade provided with an abutment, a slottedwasher arranged to be slipped down over the blade into engagement withsaid abutment, means for preventing relative rotation between thewasl'ier' and the body, a one-piece a-pertured sealing disk slidablysecured to the face of the washer by a pin and slot connection andarranged to be slipped down over said blade with and to bear against theslotted washer, said disk and blade being provided with portionsarranged to interengage, when the disk is shifted on said washer, toprevent relative longitudinal monementbetween said bladeand said disk,and means for clamping all of said elements in fixed assemblage.

2. In a renewable fuse, the combination of a tubular body, a terminalblade provided with an abutment and a restricted neck-outside of thelatter, a slotted washer arranged to he slipped down over the blade intoengag m it a d abu m t, mea r :p ve t ng at v a o etween he lo washerand the body, a one-piece apertured sealing disk slidably secured to theface of the washer by a pin and slotconnection and arranged to heslipped down over the blade with and to bear against said slotted washerand to be shifted relative to said slotted washer to engage about saidrestricted neck,

nd m a for mping said l men s i fixed assemblage.

3. a renewable fuse, the combination of a tubularv body, a terminalblade, said blade being pro id d With an abutm nt, a lo washer arrangedto he slipped down on the blade and bear against said abutment, said abum n sea i th S des f t l t in ai washer, means for preventing.relatilverota t e bet n he Was a d e b dyi o Piece answe e -l n d s aly se u e to he face of t ashe y a n nand-slo connection and arranged tobe slipped-down over the blade with and bear against said washer, saiddisk being arranged to be moved parallel with said washer to seal theendsof the slot of the latter, and means for clamping all o ai elementsin fixed assemblage.

4. In a renewable fuse, thev oombinationof a tubular. body, a terminalblade. arrang to extend through the end of said body, said blade beingprovided with an abutment and a restricted neck adjacent to the abutmentand at the outer side thereof, a slotted washer arranged to be slippeddown over the blade to rest upon the abutment and close the end of thefuse body, and a sealing disk slidably attached by a pin and slotconnection to the outer face of the slotted washer, said sealing diskbeing provided with an irregular aperture therethrough one portion ofsaid aperture being of a size to receive said blade and another portionof the aperture being of a size to clasp said restricted neck whereby bymoving said disk relative to said slotted Washer so that the firstportion of the said aperture registers with the slot in said washer thewasher and disk may be slipped in unison down over the blade and thedisk may then he slid relative to said washer so that the second portionof its aperture may clasp the restricted neck of the blade, and meansfor 1(glanping the disk and Washer to the fuse Signed at New York, N.Y., this 19th day of March, 1928.

FREDERICK C. LAVARACK.

